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发明名称
SIGNAL TRANSMITTERS
摘要
申请公布号
GB8801072(D0)
申请公布日期
1988.02.17
申请号
GB19880001072
申请日期
1988.01.19
申请人
RUSSELL, M K;RUSSELL, A W
发明人
分类号
E21B47/18
主分类号
E21B47/18
代理机构
代理人
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